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<a name="Dump-examples"></a>
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<p>
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<a name="Dump-examples-1"></a>
<h4 class="subsection">9.7.6 Dump examples</h4>
<a name="index-dump-examples"></a>

<div class="smallexample">
<pre class="smallexample">gcc -O3 -fopt-info-missed=missed.all
</pre></div>

<p>outputs missed optimization report from all the passes into
<samp>missed.all</samp>.
</p>
<p>As another example,
</p><div class="smallexample">
<pre class="smallexample">gcc -O3 -fopt-info-inline-optimized-missed=inline.txt
</pre></div>

<p>will output information about missed optimizations as well as
optimized locations from all the inlining passes into
<samp>inline.txt</samp>.
</p>
<p>If the <var>filename</var> is provided, then the dumps from all the
applicable optimizations are concatenated into the <samp>filename</samp>.
Otherwise the dump is output onto <samp>stderr</samp>. If <var>options</var> is
omitted, it defaults to <samp>optimized-optall</samp>, which means dump
all information about successful optimizations from all the passes.
In the following example, the optimization information is output on
to <samp>stderr</samp>.
</p>
<div class="smallexample">
<pre class="smallexample">gcc -O3 -fopt-info
</pre></div>

<p>Note that <samp>-fopt-info-vec-missed</samp> behaves the same as
<samp>-fopt-info-missed-vec</samp>.  The order of the optimization group
names and message types listed after <samp>-fopt-info</samp> does not matter.
</p>
<p>As another example, consider
</p>
<div class="smallexample">
<pre class="smallexample">gcc -fopt-info-vec-missed=vec.miss -fopt-info-loop-optimized=loop.opt
</pre></div>

<p>Here the two output file names <samp>vec.miss</samp> and <samp>loop.opt</samp> are
in conflict since only one output file is allowed. In this case, only
the first option takes effect and the subsequent options are
ignored. Thus only the <samp>vec.miss</samp> is produced which containts
dumps from the vectorizer about missed opportunities.
</p>


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